One-blade reamer



I H. KALTENBACH ONE-BLADE REAMER Filed June 2 1925 Patented Aug. 31, 1926.

HANS KAL'IENBAGH, F LORRACH, GERMANY.

ONE-BLADE RIB-AMER.

Application filed me 2;1925, Serial No.

One blade reamers have become known which have knife blades mounted in a groove, said knife blades being adjusted in radial direction with the aid of-radially arranged adjusting screws. With reference to those multiblade reamers the difference exists that the cutting pressure of the knife blade is intercepted, instead of by a counterknife blade, by the opposite surface of the the wall of the bore.

In one-blade reamers it has further become known to fix the reaming and countersinking knives by means of a pressure screw arranged co-axially to the shaft. I

In the one blade reamers of known type the blade is not clamped securely enough, only its, position being determined, and for this reason the knife yields easily under the action of the cutting pressure.

The invention consists in the combination of the characteristic features, which'will be set forth in the claims, whereby an unyielding mounting of the knife is ensured; said knife being easy to adjust.

An embodiment of the invention is shown, by way of example, in the accompanying drawing in which Fig. 1 shows in elevation a one blade reamer for continuous bores.

Fig. 2 is a longitudinal section of the reamer Fig. 1.

Fig.3 shows in longitudinal section aone blade reamer for recess bores.

Fig. 4 is a side elevation of Fig.3.

Fig. 5 is a cross section of Fig. 1.

Fig. 6 is a cross section of Fig. 3.

Referring to Figs. 1, 2 and 5 the knife 1 vis obliquely mounted in the shaft 2 in order to obtain a left twist of the cutting edge.

g This arrangement has stood the test for drilling in'steel while for cast iron the knife is sufficient which is arranged parallel to the shaft as shown in Figs. 3, 4 and 6. The

shaft which is hard as glass and moves on 34,4 87, and in Germany October 22, 1923.

pressure pin 3 or 3 can be of rather great 4 diameter and produces, in connection with the bearing surface 5 or 5, the frictional resistance for the knife. A great resistance from friction, which has to intercept the one component of the cutting pressure, is desirable and ensures the secured position of the knife. In Figs. 1, 2 and 5 the mounting of knife 1 and of pressure pin 3-for continuous bores is shown and in Figs. 3, 4 and 6 the arrangement for recess bores. The groove 6 or 6' serves for discharging the chips.

I claim 1.v A one blade reamer comprising in combination a shaft havin a transverse groove, one of the endwalls eing inclined to the axis of the shaft, a transverse knife blade arranged in the said transverse groove and arranged in abutting relation with the said inclined wall and a pressure screw arranged axially of the shaft and located at the oppo= site wall ofthe said groove and engaging the knife blade for forcing the same into frictional engagement with the inclined wall ofthe said groove.

2. A one blade reamer comprising in combination a shaft having a transverse groove, one of the end walls being inclined to the axis of theshaft, a transverse knife blade arranged in the said transverse groove and arranged in abutting relation with the said inclined wall and a pressure screw arranged axially of the shaft and located at the opposite wall of the said groove and engaging the knife blade for forcing the; same into frictional-engagement-with the inclined wall of the said groove, the said transverse groove having its side walls inclined laterally to the axis of the shaftto tilt the knife blade laterally. i

In testimony whereof I afiix my signature.

HANS KALTENBACH. 

